[dart:io] Adds functions to set file access and modification time

runtime/bin/file_win.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "bin/file.h"
 
 #include <fcntl.h>     // NOLINT
 #include <io.h>        // NOLINT
 #include <stdio.h>     // NOLINT
 #include <string.h>    // NOLINT
 #include <sys/stat.h>  // NOLINT
+#include <sys/utime.h>  // NOLINT
 #include <WinIoCtl.h>  // NOLINT
 
 #include "bin/builtin.h"
 #include "bin/log.h"
 #include "bin/utils.h"
 #include "bin/utils_win.h"
 #include "platform/utils.h"
 
 namespace dart {
 namespace bin {
@@ skipping 223 matching lines @@
       fd = _fileno(stderr);
       break;
     default:
       UNREACHABLE();
   }
   _setmode(fd, _O_BINARY);
   return new File(new FileHandle(fd));
 }
 
 
+static bool StatHelper(wchar_t* path, struct __stat64* st) {
+  int stat_status = _wstat64(path, st);
+  if (stat_status != 0) {
+    return false;
+  }
+  if ((st->st_mode & S_IFMT) != S_IFREG) {
+    SetLastError(ERROR_NOT_SUPPORTED);
+    return false;
+  }
+  return true;
+}
+
+
 bool File::Exists(const char* name) {
   struct __stat64 st;
   Utf8ToWideScope system_name(name);
-  bool stat_status = _wstat64(system_name.wide(), &st);
-  if (stat_status == 0) {
-    return ((st.st_mode & S_IFMT) == S_IFREG);
-  } else {
-    return false;
-  }
+  return StatHelper(system_name.wide(), &st);
 }
 
 
 bool File::Create(const char* name) {
   Utf8ToWideScope system_name(name);
   int fd = _wopen(system_name.wide(), O_RDONLY | O_CREAT, 0666);
   if (fd < 0) {
     return false;
   }
   return (close(fd) == 0);
@@ skipping 158 matching lines @@
   } else {
     SetLastError(ERROR_FILE_NOT_FOUND);
   }
   return false;
 }
 
 
 int64_t File::LengthFromPath(const char* name) {
   struct __stat64 st;
   Utf8ToWideScope system_name(name);
-  int stat_status = _wstat64(system_name.wide(), &st);
-  if (stat_status == 0) {
-    if ((st.st_mode & S_IFMT) == S_IFREG) {
-      return st.st_size;
-    } else {
-      // ERROR_DIRECTORY_NOT_SUPPORTED is not always in the message table.
-      SetLastError(ERROR_NOT_SUPPORTED);
-    }
+  if (!StatHelper(system_name.wide(), &st)) {
+    return -1;
   }
-  return -1;
+  return st.st_size;
 }
 
 
 const char* File::LinkTarget(const char* pathname) {
   const wchar_t* name = StringUtilsWin::Utf8ToWide(pathname);
   HANDLE dir_handle = CreateFileW(
       name, GENERIC_READ,
       FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL,
       OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OPEN_REPARSE_POINT,
       NULL);
@@ skipping 67 matching lines @@
       data[kAccessedTime] = st.st_atime * 1000;
       data[kMode] = st.st_mode;
       data[kSize] = st.st_size;
     } else {
       data[kType] = File::kDoesNotExist;
     }
   }
 }
 
 
+time_t File::LastAccessed(const char* name) {
+  struct __stat64 st;
+  Utf8ToWideScope system_name(name);
+  if (!StatHelper(system_name.wide(), &st)) {
+    return -1;
+  }
+  return st.st_atime;
+}
+
+
 time_t File::LastModified(const char* name) {
   struct __stat64 st;
   Utf8ToWideScope system_name(name);
-  int stat_status = _wstat64(system_name.wide(), &st);
-  if (stat_status == 0) {
-    if ((st.st_mode & S_IFMT) == S_IFREG) {
-      return st.st_mtime;
-    } else {
-      // ERROR_DIRECTORY_NOT_SUPPORTED is not always in the message table.
-      SetLastError(ERROR_NOT_SUPPORTED);
-    }
+  if (!StatHelper(system_name.wide(), &st)) {
+    return -1;
   }
-  return -1;
+  return st.st_mtime;
 }
 
 
+bool File::SetLastAccessed(const char* name, int64_t millis) {
+  // First get the current times.
+  struct __stat64 st;
+  Utf8ToWideScope system_name(name);
+  if (!StatHelper(system_name.wide(), &st)) {
+    return false;
+  }
+
+  // Set the new time:
+  struct __utimbuf64 times;
+  times.actime = millis / kMillisecondsPerSecond;
+  times.modtime = st.st_mtime;
+  return _wutime64(system_name.wide(), &times) == 0;
+}
+
+
+bool File::SetLastModified(const char* name, int64_t millis) {
+  // First get the current times.
+  struct __stat64 st;
+  Utf8ToWideScope system_name(name);
+  if (!StatHelper(system_name.wide(), &st)) {
+    return false;
+  }
+
+  // Set the new time:
+  struct __utimbuf64 times;
+  times.actime = st.st_atime;
+  times.modtime = millis / kMillisecondsPerSecond;
+  return _wutime64(system_name.wide(), &times) == 0;
+}
+
+
 bool File::IsAbsolutePath(const char* pathname) {
   // Should we consider network paths?
   if (pathname == NULL) {
     return false;
   }
   return ((strlen(pathname) > 2) && (pathname[1] == ':') &&
           ((pathname[2] == '\\') || (pathname[2] == '/')));
 }
 
 
@@ skipping 113 matching lines @@
     return kIdentical;
   } else {
     return kDifferent;
   }
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)